Attention! See the warnings at the beginning of the Section Depressurizing the supply system.
1. Before servicing the fuel lines or their fittings, it is necessary to relieve the pressure in the fuel system (see Section Depressurizing the supply system).
2. The lines of the fuel path of the power supply system are laid between the gas tank and the engine compartment. Steel tubes and flexible fuel hoses are attached to the underbody of the vehicle with clips and screw fasteners. Every time the vehicle is lifted off the ground for any purpose (e.g. to inspect or replace exhaust system components), try to take the opportunity to check the condition of the fuel lines and their fittings. Carefully inspect all hoses and tubes of the fuel path for cracks, twists, deformations and other mechanical damage.
3. If signs of internal contamination or obstruction are detected, the corresponding section of the fuel path must be removed and blown with compressed air. Be sure to also check the condition of the pump fuel intake strainer (see Section Checking the condition and replacing the fuel flow sensor).
Steel tubes
Use only high-strength steel tubes from reputable manufacturers as replacement sections.
Remember that copper and aluminum tubes are not able to withstand the vibration loads that occur during the operation of the car.
Do not forget that the fuel lines on models equipped with an injection system must withstand high internal pressure.
Often in company stores of automotive accessories you can buy sections of metal tubes equipped with threaded fitting nozzles. Use two wrenches when loosening and tightening bar connections to avoid turning the mating connector. Be sure to check the condition of the O-rings used for sealing the nipple connections. Replace worn or mechanically damaged rings immediately. Try to use only branded parts as replacement components.
Flexible hoses
Attention! When replacing fuel hoses, use only genuine high pressure parts.
The flexible fuel hoses must be routed no closer than 10 cm from the exhaust system components and no closer than 25 cm from the catalytic converter. Keep fuel lines away from bodywork and suspension components. The minimum allowable gap is 6.3 mm.
Replacement
1. Damaged sections of fuel lines (pipes or hoses) must be removed and replaced with brand new ones.
2. Relieve pressure in the supply system (see Section Depressurizing the supply system).
3. Release the section of the fuel path to be dismantled from the intermediate clamps securing it to the bottom of the vehicle.
4. If equipped, release the clamp (s) and disconnect the hose (And) from the metal line (th). If necessary, to release, rotate the hose on the fitting to facilitate its disconnection.
5. Installation is carried out in the reverse order.